Anyone can plug an electric fireplace into an existing wall outlet.
However, hard-wiring an electric fireplace is a different story. Depending on local codes, hard-wiring an electric fireplace is a project that a competent DIY’er might tackle. If regulations allow it and you have experience and knowledge of electrical practices and basic construction skills, go for it!
But, if there are questions in your mind about a project like this, call an experienced electrician. If your walls haven’t been dry-walled yet, this should be a relatively quick and inexpensive job for them.
Also, depending on the local code requirements, your WE LOVE FIRE expert may be able to install it, too.